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// File: PortData.java
// Classes: PortData
// Original Author: jrobbins@ics.uci.edu
// $Id: PortData.java,v 1.2 2004/07/26 20:39:31 bobtarling Exp $

package org.tigris.gef.demo;

import java.io.Serializable;

import org.tigris.gef.graph.GraphModel;
import org.tigris.gef.graph.presentation.NetNode;
import org.tigris.gef.graph.presentation.NetPort;


/** An example subclass of NetPort for the EquipmentApplet demo. As
 *  part of the example I constrain the ports to only connect to
 *  PortDatas.
 *
 * @see EquipmentApplet */

public class PortData extends NetPort implements Serializable {

    /** Construct a new NetPort with the given parent node and no arcs. */
    public PortData(NetNode parent) { super(parent); }

    /** Add the constraint that PortData's can only be connected to
     *  other ports of the same type. */
    public boolean canConnectTo(GraphModel gm, NetPort otherPort) {
        return (super.canConnectTo(gm, otherPort)) &&
                (otherPort.getClass() == this.getClass()) &&
                 getEdges().size() == 0;
        // needs-more-work: should work with subclasses too. This is
        // really a java.lang.Class method that is missing: isSubclass()
    }

    /** If the user starts draggin on this port, he will create a new
     *  EdgeData. */
    protected Class defaultEdgeClass(NetPort otherPort) {
        try { return Class.forName("org.tigris.gef.demo.EdgeData"); }
        catch (java.lang.ClassNotFoundException ignore) { return null; }
    }
} /* end class PortData */
